🔬 Science · Organisms & Life Processes

Cells to Organ Systems

Describe the hierarchical organisation of multicellular organisms: cells → tissues → organs → organ systems → organism

Typical age: 11–12 years

“If your child was asked to explain how the body is built up from the smallest parts to the whole, could they describe the levels from individual cells all the way up to organ systems — with a real example at each level?”

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Needs first

Plant Cells vs Animal CellsREQUIRED
The cell-to-organism hierarchy builds on understanding that different cell types exist

Unlocks next

Digestion & Enzymes
The digestive system is an organ system — the hierarchy concept gives the structural framework
Pathogens & the Immune System
The immune response involves specialised cells within organ systems (blood, lymph nodes)
The Human Skeleton
The skeleton is an organ system — understanding this level of organisation gives context
Gas Exchange & Breathing
The gas exchange system is an organ system — hierarchy concept provides structural context